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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e06af903ac682b7b5509f555432a6e62b9a3d37a85b98be47b07abe8a9b116' 
  AND token = 'YrLzJZ030N4Tp5ZbHTAM3UIIot5bEP+UBBxZYMODi2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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