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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35908ae0408ca952be9dae2e8a8200c49e3bc15779d3653a21a3ad066d350b30' 
  AND token = 'c1WoJ4dLLUo7voBX1mBh+wi7QnpkHJKHIxsDzY3+Fqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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