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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4b2f3eefe8f60eccc6ec553ae345097981cb6f83bc939755f9c9ba61c08814a' 
  AND token = 'vb4Y+mT3VYBKm4VsFnnWVQuS1WTGAlTGoLynFziw1eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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