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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f71cafb5244dc070114aac5559c759b02e0cb855f91a76e2ae1c66517fc852ee' 
  AND token = 'RcSOsA4MgVQ/U0o/RU1wnUahC9q/9LXv6Q+oIfcT4d0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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