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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a9c089a8bc56a52dd387df58008304ea2d8e3490f79b0953d61c91988749f12' 
  AND token = 'fDVxBQ3XeiiX872hVfMHHK7C+qvB8JqE/veA3nx/VRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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