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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1031da6517aeb07b3016c88480c04b06a2223e316b1748dc6739f7588c52c1a6' 
  AND token = 'hqyFF8LIk58kkVaYR7x+lOO16ezEZAUaLjnfnrsqbhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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