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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3f725fd311a60d5933756e56c262da7bdaf8fac9f62a1105eabb0315ed8e1c' 
  AND token = '4+ReswT2Qz5TnE0VHvT0Kw0uC+HPNIcD+flV9up95jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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