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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e7a41935760bd87e4a6366d7a967f989f612fbdba0098d5818abbd0a5c08a6' 
  AND token = 'EFddA4Y0OOJD16198B1jPeBTYaI6nRP4EStwO5i/LFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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