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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cb91380a9dfc6b8cfb9e049bce93bac29afca65fa06eab0a841582d1a1457b' 
  AND token = 'Q9nimvGDcDXDtgoo0SECPs8552UmMjxQdAngDptB6zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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