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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56570c5287d9d7a9f8b030f66694b2eefe429d1e33d9051a02fde51f18de9d18' 
  AND token = 'IVxNNuFW9LqFVzvbuAwnY3bTgLilhhMORUrEbU0xQxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}