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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3133c6ef5837a61b58a638d908d4a0e40b7364df5c11f9573caccba73fbb4b5c' 
  AND token = 'BSnou9Qp/YLFcdWBp5t1FRh/yILEapVj7s0OJQRM2dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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