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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56343d0d3d59063a90e1e387727174b41ef212d7e2d1ae8c0a7461ce62ffb2db' 
  AND token = 'xH6Zpi19GLRAsdflKVMh/An+OUwadkjEq+iIDiWa0ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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