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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43502a544a34de7c423ccd815f151e857461f254e0cf773b6ed939927ae633f9' 
  AND token = '9yUIvauZPAQ5cfQMra1rYJgp0J0WvZx6+62sNZF+yrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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