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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66c17e4058185ee0c2f9cd37e669b9ee9830470db5489b88062d1e996188066d' 
  AND token = 'Q12GsQ61Z4AKxL00/wdH3bKLS3GBv0A7Km9kYN4f7v4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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