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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9bba46e875bf3a3c0c77034bbe62777c090a1905dd1e250d3f6e91583ed5a30' 
  AND token = '7Ff/wV70fFD3F6xdy1j5ieWAjuLifujAiER+NDTTUU4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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