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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ecf97ebb43c028bf1d59bbaad7e4f8c873be01cc1f4bca42f23d197461781db' 
  AND token = 'RJCNij/Z0YQoiJVW8NyRIPH05i9qm67qL6pcadnSt7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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