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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb160eb8ff779c5dd3a5814d89ddf79366816c523aba64bf2f9ade3ebcc50f1' 
  AND token = 'bVHrJMFXimlJUoMW4IO54OGvubGxVnd5iOQYfySQ+uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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