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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0c7f0d13626fe6fb2c5ae65757f4c13b3f432e7f448dcbfa0c3abe827fbb7ae' 
  AND token = '/jj0QDVkRLv4OKTyZP1NOyDso8x1FhwBaXlRgIj0f40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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