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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ec537936d7fed5625042ab502afbde9b0dfeb8db84a423a3deef6d6620514a0' 
  AND token = 'Dr2TS2B/+v/dSs7uBrcNp7kqrtpG7BfU6hOhafweEJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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