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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411bb7ca6b4b5975fb51105b7c8f8500fc50c01d861185f6b128c0d9da5aa4c7' 
  AND token = 'cOig5stEkiJszno8V1ahpc5DHIAuucB1uA5VR3xMZIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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