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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cc6e5daceb958453ce98d9f732ee9e0c8be6ce6d7f8f13d297d0f5cf97aad7d' 
  AND token = 'aX/JX7mA4r0Hdog+C32tlF5hei267m4pjAM7bxfHQgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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