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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c06b4e625b993dfbac0a34eaf0918a0bea651337cb4414b517099f221f555fd3' 
  AND token = 'P9Kzuk5RiaDES7P2QdD6XECzYRZ7G74mnSj+Sc8l2IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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