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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c526af8de8cce649cae6fded13e36335ebd364eb48dfdc83e169611e95b30c04' 
  AND token = '8Sb9Idps/7PYiR4POlFjx53gmhmi2fYA0o3nx+7uCY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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