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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66744c310e57030fbfe890b98be7ec80d38330554eaff8bc62cb302566b58893' 
  AND token = '+cKMqWUv2+BfDEeg1FrHGKZL9yfPlf+f3W7/lrA/Pt0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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