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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4bf76f24514d77c712c9277012f7a81d323b65f5b798b14ab03b3961cef7343' 
  AND token = '5nNu11Ati1/8LIY+YgB2upYu0kgda4obe/ZnzPvOPxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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