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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7988f8e202716e68757883751d2e6ad142e2f90db1611d76662fe1b56a1ed8' 
  AND token = 'u8GiZfOLcHMV2JG++0Dfhp5xiz+wB5gCm6rb8sU9Gf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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