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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a54e1dd10f035567f431813b484605e95fa5e5b126d4520f0cf49265eb04832' 
  AND token = 'ZdcsLceUSlhpoDh7CfM66Hf/m7TClz817PLb9R42hZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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