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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a06c8bf4d4a7bf0776c4bbc0a0e82e201cd9e1c36c502718a092ad9ef146e2db' 
  AND token = '83dPI0cbyPTZGO7cOYu6WGljeRrXauOaVE8CtsMFD8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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