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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c920faaa5525ba5fc767757c4ee1bf29158c5e136147bc80d58057edae2a3416' 
  AND token = 'ac0JpUbpRNRYsX1/oXb3UrEjvWQTZ9JYw2HrVGQrGns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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