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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de867a261f0f01e2ea84a511296e100e58a92e0e0cec7e3236a6969825519e28' 
  AND token = 'PriC1fGu4FlLkkwYOqqYIFfrQzOIu7CoBXqkg42L+jA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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