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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83752673244dd9b7d3535930752a1933a733ec171030c22aede8bb3b8300f85' 
  AND token = 'ZUcstQeY6cr2/nSm1xd5Q95RYRfstyaieoD8Z6vzZb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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