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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51585abda232308a53fda29f0078b05cd44e957674574d0249c10737f4a1eb0' 
  AND token = 'VKqJpljfR8/glme3LdZxv9jAo7sMHk4KMPnx03lAbQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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