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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a77ff4d93824380fc15c0f2f4eebc30c504661a5ff11f5d1314f4443787fcbae' 
  AND token = 'pcF/ZVB4cv4jLr/2AVcYyk289dTDcENPgzV4ekrtwvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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