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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c0c576de5dd725bed82acf54102126aaf758f3aca413ceb2c82a3991d50c4a6' 
  AND token = 'mZ+14420sMw046bKTlYian8mlyjzcryTnuajE3s+47k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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