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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3823262ea152f19ce9cfe9cbe88c4d773d05c3c1cc0194acc8acbb17b3e7fac0' 
  AND token = 'o1eiQqTE7Lmu/JV61G96Fcm9BwuYJlU48wjoPN4TooI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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