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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add37dd5defbc081a764dc6b93d62540989af028c5acd5e73e2f206e948db4a9' 
  AND token = 'VLJBrbe8IM2hkq64RLqhHFEIj0duNUkfJ+OcKKdQwUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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