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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f8382b51de6572cfe3bddc23e077bbc1be654e5b6ef82f5fa055f3d3fdddf9' 
  AND token = '1S75BDWGWiyjDY0JacOaSMczVqVaaReRbbkvqNyzAz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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