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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0995c60636983d537ea4d0ef3011a92f749f87d6a82abde61029d5f08484ce1' 
  AND token = 'gkyvS0QizZSxRgNi6KDuvm7igSO0aWrC9VysujUrB38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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