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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6cb373bc0095edc70536cd7bea449fe0fc6ace060ff202d652e8bf8b95e4d6f' 
  AND token = 'xMInyYU62tCST3EZ7ALRpGEjsuSFu5pRwnQuRyhTKY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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