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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a089a5b196ab1be9c9768be00029fb6fcbb70eff8e18c7509b1ef80e3eb6a94' 
  AND token = 'sr1WOuyZ5KBXGgfMWyH3uWUzKp1IAsscoelBT5FJaQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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