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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f0c9bc24c8cf45e20a19f410c8d667a7293cbe38bea146586cfe4e79f1d947' 
  AND token = '4YznciN7WCZ+WVhSoqVL3FK3Yxjn5MZRZKndPZEHQnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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