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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c350fd320a0fc07dc34d12edd43ee7076320d5a2d2cedae505ef44b25113c0' 
  AND token = '00a+olgV0e/jxLcpP9CRJ1YM5wpteGC5YNXzrthM/Gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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