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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61675b125e7e66c84df886ee04fbb889083b8a3e20f015780cf9a8fe549a61eb' 
  AND token = 'lGtsOk19sObLsr5Bzbbr+pnlHLBBZr/9FiOGx57nkfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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