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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46489528ce83745a12c52ae7fc732355a5a5476942848f6e925744d5935c4b65' 
  AND token = 'vRXR82WGcb6iyk3c6utq8PSFb6o00B/8ilwH5m4SBsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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