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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c62c777ccee625ded95cec311088c0bb471d44e01ef8095722d4d54f28d02586' 
  AND token = 'LHzsxb77B4sLOg4WYGhsfswtbmeKGY2F2ZhZHKSYdRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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