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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d03e839e1b77a2a879e4382826f908b370ca76e21ce614a406aaf10963d81f2' 
  AND token = 'KYtFKLKoe7E/8FxlVt/RktWXiEVNotJNmny+63Wv694=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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