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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e473193bfe2de9d9dcab2bf8e1ef20c0b8e20dae35beafa6b78e39c73b64239' 
  AND token = 'TvE9JCefMNyV21gL08zO1NGwZkcZO3kV9bQ+B54MShE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00141

JSON explain

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