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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4928a1532e4144739619ae3d4d827e4e77e4bd8253db1ddef0bdb6b545ab6b8' 
  AND token = 'v/N5gxfgcATPyflHGosHvv1eB4xxZexpQWKl+Do//i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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