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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55af8342a90dda29ff33fa45d4cfb5c29803692e3def69720260e13cecde9f1f' 
  AND token = 'geUJhxrcZ7LcyQ1vpVD3Q99jvzxBscCBzMTB573N00A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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