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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9a0d063cb59be549ef49daa692c3eb9b67d0d74bb7c91604664e756129733c' 
  AND token = 'l9XgZL4HkB/6Riav8cLYiFgiNLdY+I5Z9puCfG5Slcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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