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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71d3ea76cc39e1447937621b925e30cc88f778a97719602aeae05b2fa81c27d' 
  AND token = 'hbLP1RnZYNP2FlnTdRqNCtUM/i3hbF352ByHAp5vNKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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