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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8657bff92ff45ce090052eae64b37d26e79d894814c5eca4531b082083e52a6d' 
  AND token = 'GquqejHAc2GjTQZ6mJfyyuze/pVl/l5Ffanw3rD4P0I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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