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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6909c96b8c76f937117f3510e7ed93f5f3f6a1fc5a6dfab64206a06d79a560dc' 
  AND token = 'thsNk1IU7+BlZlmqfWOOy6R3kVB5wjuvUHbyGPAxbNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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