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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbf2308d6d054a9263517691125298dd47c5313fe191d2e252ed5d19458a94f5' 
  AND token = 'wXed7A4o5xe45gxbSDZdkf39WWofdlvweQ7/LQZ/mT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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