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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b47241ae9d8919b6bbb2e1762943e472af6106a2975780d9fd78b9a18f7c0e' 
  AND token = 'BAgeydbZd012f06913DkjK5udlqK41UaGMd2pC0up+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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