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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a95c96c3874f27969faea58183b0909d5bb8387db75d77b630c90846695c2d0a' 
  AND token = 'SSj8qCYNsk/E92t8NTdGzdhLDhAoyi8//b7aOEg2JBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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