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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81994b2cdbd57e913a94c70089a354688d1b64ddf006e45ba624096f999e14af' 
  AND token = 'BLkQ7WohW2cybKhR7VOMexY7LIhIpGBi1idph7mX4Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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