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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922b5d3694f7e185bd9928452a8826e23953b663a788a027ffd2028d42b4135b' 
  AND token = 'I8OCQQqRzqEKl+A4srSy6hqWLEtmY6yd8m6v7dDdLAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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