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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658a2d1f5a451e021665f8713f533f81f62618a25feb1f96c65d0ac885ee9a08' 
  AND token = 'biyffmrDhPB91GkdMiFxf2XZn1bYmLTo6uiTADJkix0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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