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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7e4379a996ca8260521599f3884b67f6fac39eb7d6a83a92579d84467e0af19' 
  AND token = 'I+E/b7gnlQNzgFX5h2tSxkCVqUQSfRuU902GfxY/eMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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