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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07404f307671edf7c1efc122f7e7c6f9591a9c07f131fe72aa72d6871914d133' 
  AND token = 'pydDl/3KvaN9pspGn2CoLE8D0o23Qyi5huhJhpjepNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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