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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa87d234c41b6f6e7846b5d1a9fe6ec6b90229a101f616be96a51bc965e463f5' 
  AND token = '0koh8uBSzSPNX9ZMb+HBWI/KIgpAf8sq9/OsZo7S+pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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