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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b2f7c6b470dfd9c0433b8f5231a53b017adc13635dcc65f3b60253f206c5b8' 
  AND token = 'Pg6znzxn+QXq9iY2HMZNLZ0uzkuO9BQ/IwS9UEb6y3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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