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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9caffc40e600c1ea60345ae457f84b194154b3e7104aecb422ce1a56655ab1b2' 
  AND token = '5PzMYChhpIUrLoXJ6KsKa6o1NlUE+9isxWEcNNj9kgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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