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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0dea84e20c67f096425c5966f76d938a897a305b89d51a0ce923f21aef5101' 
  AND token = 'e/3/abHAdyf/z+J/3h56pJS0lcuD2f0/HrmQD0NX7+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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