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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13701f26f86caa663fbc4df73cc6f90c6f06ffc4c81e7b5985e242b75f877e90' 
  AND token = 'WLWosT5UHWzCj/Kzv21+orhBaLHSlbzmiMX/prN1QoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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